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Edit by Brett Hartt:

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[* icon_caution] When working with batteries, you must always remove the negative lead from the battery first, even if the corrosion is only on the positive lead.
[* black] It is also a very good idea to work with one hand behind your back, just to make sure that you don't accidentally short the circuit on the battery.
[* black] Using a '''box wrench''' loosen the nut on the screw holding the '''negative''' terminal in place.
[* black] If the corrosion is preventing you from accessing the nut, use a the other end of the wrench or another scraping tool to scrape some of the corrosion away.
[* black] Pull the negative battery cable off of the negative lead.